Potassium tert-butoxide → 1-(2-(tert-butyldimethylsilyloxy)-1-(4-chloro-3-fluorophenyl)ethyl)-4-(2-(methylthio)pyrimidin-4-yl)pyrimidin-2(1H)-one

Participants

Reaction Steps

Potassium 2-methylpropan-2-olate (0.026 g, 0.24 mmol) and tetrabutylammonium iodide (0.0067 g, 0.018 mmol) were added to 4-(2-(methylthio)pyrimidin-4-yl)pyrimidin-2(1H)-one (0.040 g, 0.18 mmol) suspended in THF (4 mL) cooled in ice. After 10 minutes, a solution of 2-(tert-butyldimethylsilyloxy)-1-(4-chloro-3-fluorophenyl)ethyl methanesulfonate (0.10 g, 0.27 mmol) in THF (1 mL) was added. The mixture was stirred at room temperature overnight and then heated at 90° C. for 3 days. Due to incomplete reaction, the material was transferred to a microwave vial and heated in a microwave at 130° C. for 1 hour. The reaction mixture was evaporated, and the residue was chromatographed on a 10 g Biotage SNAP column with 1:1 hexane/EtOAc. Fractions 8-13 contained the desired 1-(2-(tert-butyldimethylsilyloxy)-1-(4-chloro-3-fluorophenyl)ethyl)-4-(2-(methylthio)pyrimidin-4-yl)pyrimidin-2(1H)-one (0.030 g, 0.059 mmol, 33% yield) as a film.

Provenance & Evidence